[No authors listed]
The proA proline biosynthesis gene of thermophilic bacterium Thermus ruber was cloned and sequenced, and several properties of the encoded enzyme, gamma-glutamylphosphate reductase (GPR) were studied. The proA open reading frame (ORF) was of 1286 bp. Nucleotide sequence analysis revealed the ATG initiation codon in position 36 and the TTA termination codon in position 1304. A deduced protein product of the gene was shown to be of 44,919 Da in molecular weight. The GC content was 66%, as is characteristic of various bacteria of the genus Thermus. An amino acid sequence encoded by the cloned gene showed the highest homology (up to 64%) with GPR of T. thermophilus. The maximum activity of GPR (8.2 x 10(-2) units/ml) was observed at 55 degrees C. A weak enzymatic activity was also detected at 70 degrees C. The enzyme can be used in biotechnological studies.
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